To cite package ‘OnAge’ in publications use:

  Douhard, F., Gaillard, J.-M., Pellerin, M., Jacob, L. and Lemaître,
  J.-F. (2017), The cost of growing large: costs of post-weaning growth
  on body mass senescence in a wild mammal. Oikos, 126: 1329–1338.
  doi:10.1111/oik.04421

A BibTeX entry for LaTeX users is

  @Article{,
    author = {{Douhard} and {Frederic} and {Gaillard} and {Jean-Michel} and {Pellerin} and {Maryline} and {Jacob} and {Laurent} and {Lemaitre} and {Jean-Francois}},
    title = {The cost of growing large: costs of post-weaning growth on body mass senescence in a wild mammal},
    journal = {Oikos},
    volume = {126},
    number = {9},
    pages = {1329--1338},
    publisher = {Blackwell Publishing Ltd},
    issn = {1600-0706},
    url = {http://dx.doi.org/10.1111/oik.04421},
    doi = {10.1111/oik.04421},
    year = {2017},
  }